Types of VelocityAverage Velocity - Just what it sounds like. Total distance divided by total time. Instantaneous Velocity - Velocity in an instant.Initial Velocity - Velocity at the start of our observation.Final Velocity - Velocity at the end of our observation.Change in Velocity - How much did velocity change? This is always Final minus Initial (it can be negative).AccelerationAcceleration is the rate of change in velocity.Â Â In this class we will be dealing with average or constant acceleration, which is change in velocity divided by time.Â We may, at times refer to non-constant acceleration, but we will not solve problems dealing with it. Â Acceleration is Not VelocityRemember, when we talk about how fast something is moving we're talking about velocity. When we talk about how fast something is speeding up we are talking about acceleration.We need to be very careful in our choice of words. If I say we're going forward, what does that mean? (think about position and velocity)Â Position (or distance from the origin) is getting bigger.Velocity is positiveBut we don't know if velocity is constant.Decceleration Does Not ExistIn physics we try not to us the word decelerate. Instead, while moving forward, if we are speeding up we have positive acceleration and when we slow down we have negative acceleration.What about if we're "going" backwards?